frostfs-node/pkg/services/policer/check.go

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package policer
import (
"context"
"errors"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
objectcore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
headsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/head"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/replicator"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
"go.uber.org/zap"
)
// tracks Policer's check progress.
type nodeCache map[uint64]bool
func newNodeCache() *nodeCache {
m := make(map[uint64]bool)
return (*nodeCache)(&m)
}
func (n *nodeCache) set(node netmap.NodeInfo, val bool) {
(*n)[node.Hash()] = val
}
// submits storage node as a candidate to store the object replica in case of
// shortage.
func (n *nodeCache) submitReplicaCandidate(node netmap.NodeInfo) {
n.set(node, false)
}
// submits storage node as a current object replica holder.
func (n *nodeCache) submitReplicaHolder(node netmap.NodeInfo) {
n.set(node, true)
}
// processStatus returns current processing status of the storage node
//
// >0 if node does not currently hold the object
// 0 if node already holds the object
// <0 if node has not been processed yet
func (n *nodeCache) processStatus(node netmap.NodeInfo) int8 {
val, ok := (*n)[node.Hash()]
if !ok {
return -1
}
if val {
return 0
}
return 1
}
// SubmitSuccessfulReplication marks given storage node as a current object
// replica holder.
//
// SubmitSuccessfulReplication implements replicator.TaskResult.
func (n *nodeCache) SubmitSuccessfulReplication(node netmap.NodeInfo) {
n.submitReplicaHolder(node)
}
func (p *Policer) processObject(ctx context.Context, addrWithType objectcore.AddressWithType) {
addr := addrWithType.Address
idCnr := addr.Container()
idObj := addr.Object()
cnr, err := p.cnrSrc.Get(idCnr)
if err != nil {
p.log.Error("could not get container",
zap.Stringer("cid", idCnr),
zap.String("error", err.Error()),
)
if container.IsErrNotFound(err) {
var prm engine.InhumePrm
prm.MarkAsGarbage(addrWithType.Address)
prm.WithForceRemoval()
_, err := p.jobQueue.localStorage.Inhume(prm)
if err != nil {
p.log.Error("could not inhume object with missing container",
zap.Stringer("cid", idCnr),
zap.Stringer("oid", idObj),
zap.String("error", err.Error()))
}
}
return
}
policy := cnr.Value.PlacementPolicy()
nn, err := p.placementBuilder.BuildPlacement(idCnr, &idObj, policy)
if err != nil {
p.log.Error("could not build placement vector for object",
zap.Stringer("cid", idCnr),
zap.String("error", err.Error()),
)
return
}
c := &processPlacementContext{
Context: ctx,
}
var numOfContainerNodes int
for i := range nn {
numOfContainerNodes += len(nn[i])
}
// cached info about already checked nodes
checkedNodes := newNodeCache()
for i := range nn {
select {
case <-ctx.Done():
return
default:
}
p.processNodes(c, addrWithType, nn[i], policy.ReplicaNumberByIndex(i), checkedNodes)
}
if !c.needLocalCopy && c.removeLocalCopy {
p.log.Info("redundant local object copy detected",
zap.Stringer("object", addr),
)
p.cbRedundantCopy(addr)
}
}
// nolint: containedctx
type processPlacementContext struct {
context.Context
// needLocalCopy is true if the current node must store an object according to the storage policy.
needLocalCopy bool
// removeLocalCopy is true if all copies are stored according to the storage policy
// and the current node doesn't need to store an object.
removeLocalCopy bool
}
// nolint: funlen
func (p *Policer) processNodes(ctx *processPlacementContext, addrWithType objectcore.AddressWithType,
nodes []netmap.NodeInfo, shortage uint32, checkedNodes *nodeCache) {
addr := addrWithType.Address
typ := addrWithType.Type
prm := new(headsvc.RemoteHeadPrm).WithObjectAddress(addr)
// Number of copies that are stored on maintenance nodes.
var uncheckedCopies int
handleMaintenance := func(node netmap.NodeInfo) {
// consider remote nodes under maintenance as problem OK. Such
// nodes MAY not respond with object, however, this is how we
// prevent spam with new replicas.
// However, additional copies should not be removed in this case,
// because we can remove the only copy this way.
checkedNodes.submitReplicaHolder(node)
shortage--
uncheckedCopies++
p.log.Debug("consider node under maintenance as OK",
zap.String("node", netmap.StringifyPublicKey(node)),
)
}
if typ == object.TypeLock {
// all nodes of a container must store the `LOCK` objects
// for correct object removal protection:
// - `LOCK` objects are broadcast on their PUT requests;
// - `LOCK` object removal is a prohibited action in the GC.
shortage = uint32(len(nodes))
}
for i := 0; shortage > 0 && i < len(nodes); i++ {
select {
case <-ctx.Done():
return
default:
}
if p.netmapKeys.IsLocalKey(nodes[i].PublicKey()) {
ctx.needLocalCopy = true
shortage--
} else if nodes[i].IsMaintenance() {
handleMaintenance(nodes[i])
} else {
if status := checkedNodes.processStatus(nodes[i]); status >= 0 {
if status == 0 {
// node already contains replica, no need to replicate
nodes = append(nodes[:i], nodes[i+1:]...)
i--
shortage--
}
continue
}
callCtx, cancel := context.WithTimeout(ctx, p.headTimeout)
_, err := p.remoteHeader.Head(callCtx, prm.WithNodeInfo(nodes[i]))
cancel()
if client.IsErrObjectNotFound(err) {
checkedNodes.submitReplicaCandidate(nodes[i])
continue
}
if isClientErrMaintenance(err) {
handleMaintenance(nodes[i])
} else if err != nil {
p.log.Error("receive object header to check policy compliance",
zap.Stringer("object", addr),
zap.String("error", err.Error()),
)
} else {
shortage--
checkedNodes.submitReplicaHolder(nodes[i])
}
}
nodes = append(nodes[:i], nodes[i+1:]...)
i--
}
if shortage > 0 {
p.log.Debug("shortage of object copies detected",
zap.Stringer("object", addr),
zap.Uint32("shortage", shortage),
)
var task replicator.Task
task.SetObjectAddress(addr)
task.SetNodes(nodes)
task.SetCopiesNumber(shortage)
p.replicator.HandleTask(ctx, task, checkedNodes)
} else if uncheckedCopies > 0 {
// If we have more copies than needed, but some of them are from the maintenance nodes,
// save the local copy.
p.log.Debug("some of the copies are stored on nodes under maintenance, save local copy",
zap.Int("count", uncheckedCopies))
} else if uncheckedCopies == 0 {
// Safe to remove: checked all copies, shortage == 0.
ctx.removeLocalCopy = true
}
}
// isClientErrMaintenance checks if err corresponds to FrostFS status return
// which tells that node is currently under maintenance. Supports wrapped
// errors.
//
// Similar to client.IsErr___ errors, consider replacing to FrostFS SDK.
func isClientErrMaintenance(err error) bool {
switch unwrapErr(err).(type) {
default:
return false
case
apistatus.NodeUnderMaintenance,
*apistatus.NodeUnderMaintenance:
return true
}
}
// unwrapErr unwraps error using errors.Unwrap.
func unwrapErr(err error) error {
for e := errors.Unwrap(err); e != nil; e = errors.Unwrap(err) {
err = e
}
return err
}